Evian's buvette, a masterpiece?

"A veritable icon of twentieth-century architecture", "a technical object of exceptional value", "precision engineering", "undeniable originality", professionals are at a loss for words to describe the buvette dʹEvian, inaugurated in 1957 for the spa's clientele. The driving force behind this masterpiece was a brilliant builder: Jean Prouvé. Who was Jean Prouvé?